width of seam on backing?

Hi all... my quilty friend and I had a lovely day today sewing... first on the quilt block challenge for the county fair (whew, glad that block is finished!)... then on our own projects. Here's my question, and it's an easy question for you I hope, but I really want/need to know??? Do I stay with a 1/4" seam on the two lengths of fabric I'm sewing together for the backing of a small quilt I've finished? It seems as though it should be a little deeper seam, but I really don't know? Thanks for helping!!

Aside from longarming, I think it depends a lot on the quilting. If you have a seam in the backing running the length of the quilt without quilting lines running over it periodically, then I would want a wider seam because of the additional stress the seam will be subjected to.

There really is no reason to use 1/4" seam on the backing anyway, unless possibly if you are handquilting (and even then it probably would make very little difference to a hand quilter).

I use a 1/2" seam when joining pieces for a quilt back. But I take it a step further. I'll then grade the seam (cutting one smaller than the other) so that when I press them to one side, it avoids a big lump where you go over the three layers of fabric. If you press your seam open, then it doesn't matter about the grading of the seam allowance.